tofsee | 325a874d9620fca74cba2bbca78fbb73cf1636fe399a8666e3ca34fe2aed8c09

Analysis

max time kernel
150s
max time network
137s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
30-12-2024 23:16

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General

Target

c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe
Size

260KB
MD5

17e796c1d99911ce19512a8adb8ea55a
SHA1

e4e6aa0076157643919abbf26d9a444fd170d2e9
SHA256

c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f
SHA512

24c4e6e1303a817842d3a6019183d252abf24877aab184459782f7c1eac608feadf04f537164fec59e6ac30598759ccfb7fb7d85240fd5b527a15b8152951342
SSDEEP

3072:xXO0xmVPc4N9LLXf3D7n5ksUGMAHXijUgzYcYhvT+iyQuvM/h3R:VNmVPhN9LjDfUK3j/W8

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

svartalfheim.top

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Tofsee family
tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\bzvbykq = "0"	svchost.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
2840	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\bzvbykq\ImagePath = "C:\\Windows\\SysWOW64\\bzvbykq\\olfgdlbi.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2612	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2856	olfgdlbi.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2856 set thread context of 2612	2856	olfgdlbi.exe	43

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
2088	sc.exe
2284	sc.exe
2824	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe

System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	olfgdlbi.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2588 wrote to memory of 2064	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	30
PID 2588 wrote to memory of 2064	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	30
PID 2588 wrote to memory of 2064	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	30
PID 2588 wrote to memory of 2064	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	30
PID 2588 wrote to memory of 2532	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	32
PID 2588 wrote to memory of 2532	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	32
PID 2588 wrote to memory of 2532	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	32
PID 2588 wrote to memory of 2532	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	32
PID 2588 wrote to memory of 2284	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	34
PID 2588 wrote to memory of 2284	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	34
PID 2588 wrote to memory of 2284	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	34
PID 2588 wrote to memory of 2284	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	34
PID 2588 wrote to memory of 2824	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	36
PID 2588 wrote to memory of 2824	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	36
PID 2588 wrote to memory of 2824	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	36
PID 2588 wrote to memory of 2824	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	36
PID 2588 wrote to memory of 2088	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	38
PID 2588 wrote to memory of 2088	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	38
PID 2588 wrote to memory of 2088	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	38
PID 2588 wrote to memory of 2088	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	38
PID 2588 wrote to memory of 2840	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	41
PID 2588 wrote to memory of 2840	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	41
PID 2588 wrote to memory of 2840	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	41
PID 2588 wrote to memory of 2840	2588	c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe	41
PID 2856 wrote to memory of 2612	2856	olfgdlbi.exe	43
PID 2856 wrote to memory of 2612	2856	olfgdlbi.exe	43
PID 2856 wrote to memory of 2612	2856	olfgdlbi.exe	43
PID 2856 wrote to memory of 2612	2856	olfgdlbi.exe	43
PID 2856 wrote to memory of 2612	2856	olfgdlbi.exe	43
PID 2856 wrote to memory of 2612	2856	olfgdlbi.exe	43

C:\Users\Admin\AppData\Local\Temp\c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe
"C:\Users\Admin\AppData\Local\Temp\c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2588
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bzvbykq\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2064
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\olfgdlbi.exe" C:\Windows\SysWOW64\bzvbykq\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2532
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create bzvbykq binPath= "C:\Windows\SysWOW64\bzvbykq\olfgdlbi.exe /d\"C:\Users\Admin\AppData\Local\Temp\c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2284
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description bzvbykq "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2824
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start bzvbykq
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2088
- C:\Windows\SysWOW64\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
  2⤵
  - Modifies Windows Firewall
  - Event Triggered Execution: Netsh Helper DLL
  - System Location Discovery: System Language Discovery
  PID:2840

C:\Windows\SysWOW64\bzvbykq\olfgdlbi.exe
C:\Windows\SysWOW64\bzvbykq\olfgdlbi.exe /d"C:\Users\Admin\AppData\Local\Temp\c944b1c3a2ec3d3141c00e8b83c4a88b5c76057f1119b3de079056fd65d2d33f.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2856
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2612

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

T1569

Service Execution

T1569.002

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\olfgdlbi.exe

Filesize
14.6MB

MD5
b2f784d83ea728b6eaa2276379194f60

SHA1
e5caedba8fbc98cfc259491f1e3a9abe00b99b51

SHA256
3d2713334f36c02d1c55f45e0c5fe3db6f03f4aeac4fd98cea4364997300a5ba

SHA512
fb70e005a88d21fd709a967c35ad2d5991e2405a7922da63f24de4c18756204079106257fef7490c3416a0e7c1fe5383061c2bc385a047e76c3956e9f1d2c842

Download Submit
memory/2588-8-0x0000000000400000-0x0000000002C2E000-memory.dmp

Filesize
40.2MB

Download
memory/2588-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2588-2-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2588-10-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2588-9-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2588-1-0x0000000002CC0000-0x0000000002DC0000-memory.dmp

Filesize
1024KB

Download
memory/2612-14-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2612-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2612-11-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2612-17-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2612-18-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2856-15-0x0000000000400000-0x0000000002C2E000-memory.dmp

Filesize
40.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads